Configure secure and seamless RDP/SSH connectivity to your virtual machines directly in the Azure portal over SSL. When you connect via Azure Bastion, your virtual machines do not need a public IP address

Virtual network

Azure Virtual Network (VNet) is the fundamental building block for your private network in Azure. You can use a VNets to:

Communicate between Azure resources: You can deploy VMs, and several other types of Azure resources to a virtual network, such as Azure App Service Environments, the Azure Kubernetes Service (AKS), and Azure Virtual Machine Scale Sets. To view a complete list of Azure resources that you can deploy into a virtual network, see Virtual network service integration.

Communicate between each other: You can connect virtual networks to each other, enabling resources in either virtual network to communicate with each other, using virtual network peering. The virtual networks you connect can be in the same, or different, Azure regions. For more information, see Virtual network peering.

Communicate to the internet: All resources in a VNet can communicate outbound to the internet, by default. You can communicate inbound to a resource by assigning a public IP address or a public Load Balancer. You can also use Public IP addresses or public Load Balancer to manage your outbound connections.

Communicate with on-premises networks: You can connect your on-premises computers and networks to a virtual network using VPN Gateway or ExpressRoute.

ExpressRoute

ExpressRoute enables you to extend your on-premises networks into the Microsoft cloud over a private connection facilitated by a connectivity provider. This connection is private. Traffic does not go over the internet. With ExpressRoute, you can establish connections to Microsoft cloud services, such as Microsoft Azure, Office 365, and Dynamics 365. For more information, see What is ExpressRoute?.

VPN Gateway

VPN Gateway helps you create encrypted cross-premises connections to your virtual network from on-premises locations, or create encrypted connections between VNets. There are different configurations available for VPN Gateway connections, such as, site-to-site, point-to-site, or VNet to VNet.
The following diagram illustrates multiple site-to-site VPN connections to the same virtual network.

For more information about different types of VPN connections, see VPN Gateway.

Virtual WAN

Azure Virtual WAN is a networking service that provides optimized and automated branch connectivity to, and through, Azure. Azure regions serve as hubs that you can choose to connect your branches to. You can leverage the Azure backbone to also connect branches and enjoy branch-to-VNet connectivity.
Azure Virtual WAN brings together many Azure cloud connectivity services such as site-to-site VPN, ExpressRoute, point-to-site user VPN into a single operational interface. Connectivity to Azure VNets is established by using virtual network connections. For more information, see What is Azure virtual WAN?.

Azure DNS

Azure DNS is a hosting service for DNS domains that provides name resolution by using Microsoft Azure infrastructure. By hosting your domains in Azure, you can manage your DNS records by using the same credentials, APIs, tools, and billing as your other Azure services. For more information, see What is Azure DNS?.

Azure Bastion (Preview)

The Azure Bastion service is a new fully platform-managed PaaS service that you provision inside your virtual network. It provides secure and seamless RDP/SSH connectivity to your virtual machines directly in the Azure portal over SSL. When you connect via Azure Bastion, your virtual machines do not need a public IP address. For more information, see What is Azure Bastion?.

Azure Firewall is a managed, cloud-based network security service that protects your Azure Virtual Network resources. It's a fully stateful firewall as a service with built-in high availability and unrestricted cloud scalability.

DDoS Protection

Azure DDoS Protection provides countermeasures against the most sophisticated DDoS threats. The service provides enhanced DDoS mitigation capabilities for your application and resources deployed in your virtual networks. Additionally, customers using Azure DDoS Protection have access to DDoS Rapid Response support to engage DDoS experts during an active attack.

Web Application Firewall

Azure Web Application Firewall (WAF) provides protection to your web applications from common web exploits and vulnerabilities such as SQL injection, and cross site scripting. Azure WAF provides out of box protection from OWASP top 10 vulnerabilities via managed rules. Additionally customers can also configure custom rules, which are customer managed rules to provide additional protection based on source IP range, and request attributes such as headers, cookies, form data fields or query string parameters.

Network security groups

You can filter network traffic to and from Azure resources in an Azure virtual network with a network security group. For more information, see Security Overview.

Service endpoints

Virtual Network (VNet) service endpoints extend your virtual network private address space and the identity of your VNet to the Azure services, over a direct connection. Endpoints allow you to secure your critical Azure service resources to only your virtual networks. Traffic from your VNet to the Azure service always remains on the Microsoft Azure backbone network. For more information, see Virtual network service endpoints.

Content Delivery Network

Azure Content Delivery Network (CDN) offers developers a global solution for rapidly delivering high-bandwidth content to users by caching their content at strategically placed physical nodes across the world. For more information about Azure CDN, see Azure Content Delivery Network

Azure Front Door service

Azure Front Door Service enables you to define, manage, and monitor the global routing for your web traffic by optimizing for best performance and instant global failover for high availability. With Front Door, you can transform your global (multi-region) consumer and enterprise applications into robust, high-performance personalized modern applications, APIs, and content that reach a global audience with Azure. For more information, see Azure Front Door.

Traffic Manager

Azure Traffic Manager is a DNS-based traffic load balancer that enables you to distribute traffic optimally to services across global Azure regions, while providing high availability and responsiveness. Traffic Manager provides a range of traffic-routing methods to distribute traffic such as priority, weighted, performance, geographic, multi-value, or subnet. For more information about traffic routing methods, see Traffic Manager routing methods.

The following diagram shows endpoint priority-based routing with Traffic Manager:

Load Balancer

The Azure Load Balancer provides high-performance, low-latency Layer 4 load-balancing for all UDP and TCP protocols. It manages inbound and outbound connections. You can configure public and internal load-balanced endpoints. You can define rules to map inbound connections to back-end pool destinations by using TCP and HTTP health-probing options to manage service availability. To learn more about Load Balancer, read the Load Balancer overview article.

The following picture shows an Internet-facing multi-tier application that utilizes both external and internal load balancers:

Application Gateway

Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. It is an Application Delivery Controller (ADC) as a service, offering various layer 7 load-balancing capabilities for your applications. For more information, see What is Azure Application Gateway?.

The following diagram shows url path-based routing with Application Gateway.

ExpressRoute Monitor

Azure Monitor

Azure Monitor maximizes the availability and performance of your applications by delivering a comprehensive solution for collecting, analyzing, and acting on telemetry from your cloud and on-premises environments. It helps you understand how your applications are performing and proactively identifies issues affecting them and the resources they depend on. For more information, see Azure Monitor Overview.